FOC_25_Epidendroidea..

490
● Epiphytic on tree trunks in open forests; 700–2000 m. C and S
Taiwan.
7. Luisia brachystachys (Lindley) Blume, Rumphia 4: 50.
1849.
小花钗子股 xiao hua chai zi gu
Mesoclastes brachystachys Lindley, Gen. Sp. Orchid. Pl.
45. 1830; Luisia siamensis Rolfe ex Downie.
Stems suberect, to 18 cm, stout, ca. 7 mm in diam., internodes
1–1.5 cm. Leaves 9–11 cm × 3–4 mm, obtuse. Inflorescences
2 or 3, ca. 1 cm, 3–6-flowered; rachis 3–4 mm in diam.;
floral bracts ovate-triangular, ca. 2 mm, fleshy. Flowers opening
widely, sepals and petals yellowish green, abaxial midvein purplish
brown, lip pale yellow, column green, purple margined,
anther cap yellow spotted with purple; pedicel and ovary pale
yellow, tinged with purplish brown, ca. 6 mm. Dorsal sepal
ovate, ca. 4 × 2.3 mm, obtuse; lateral sepals ovate-oblong, 4–
4.5 × ca. 2.5 mm, dorsally slightly carinate and keel becoming
winged at apex, apex obtuse. Petals narrowly oblong, 5–6 ×
1.6–1.8 mm, obtuse; lip ca. 5 mm, glabrous, without a distinct
boundary between epichile and hypochile; hypochile concave,
narrower than epichile, base without distinct lateral lobes; epichile
nearly suborbicular or triangular-rhombic, ca. 3 × 4.5 mm,
obtuse. Column ca. 2.5 mm, stout. Fl. Apr. 2n = 40.
Epiphytic on tree trunks in forests along valleys; 600–1300 m. S
Yunnan [Bhutan, India, Laos, Myanmar, Vietnam].
8. Luisia zollingeri H. G. Reichenbach, Ann. Bot. Syst. 6: 622.
1863.
长叶钗子股 chang ye chai zi gu
Stems erect or arching, to 30 cm, 5–7 mm in diam., sometimes
branched, internodes 1.5–2 cm. Leaves usually borne
from upper part of stem, 12–17 cm × 3–4 mm, obtuse. Inflorescences
opposite to leaves, ca. 1 cm, 3–6-flowered; rachis ca. 7
mm, thick; floral bracts broadly ovate-triangular, ca. 2 mm,
fleshy. Flowers opening widely, sepals and petals pale pink,
abaxially lateral sepals yellowish green in basal half, lip purplered,
apical margin green, abaxially yellowish green, column
purplish red, anther cap yellow; pedicel and ovary green, ca. 6
mm. Dorsal sepal ovate, ca. 4 × 3 mm, obtuse; lateral sepals
subovate, ca. 6 × 2.8 mm, dorsally slightly carinate, but winged
toward apex and forming a narrowly winged mucro protruding
from apex. Petals obovate-elliptic, ca. 5 × 3.2 mm, obtuse; lip
ca. 5 × 4.5 mm, without a distinct boundary between epichile
and hypochile; hypochile broader than epichile, concave, with 2
small lateral lobes, and a pair of calli at base bordering base of
column; epichile suborbicular, glabrous, entire. Column ca. 2.5
mm, thick. Fl. May.
Epiphytic on tree trunks in forests along valleys; 500–1000 m. S
Yunnan [India (Andaman Islands), Indonesia, Malaysia, Thailand, Vietnam].
9. Luisia filiformis J. D. Hooker, Fl. Brit. India 6: 23. 1890.
长瓣钗子股 chang ban chai zi gu
Stems often pendulous, 34–90 cm, 4–5 mm in diam., internodes
3–4 cm. Leaves secund, 14–26 cm × ca. 3 mm. Inflorescences
erect, arising from lower part or near base of stem, 1–2
EPIDENDROIDEAE
cm, few flowered; floral bracts broadly ovate-triangular, ca. 2
mm, fleshy. Flowers slightly fleshy, whitish, lip dark purple;
pedicel and ovary ca. 8 mm. Dorsal sepal ovate, ca. 7 × 3 mm,
concave, obtuse; lateral sepals similar to dorsal sepal, ca. 8 × 3
mm, dorsally carinate and becoming winged at apex. Petals
linear, 8–11 × 1.5–1.7 mm, obtuse; lip ca. 7 mm, with a distinct
boundary between epichile and hypochile; hypochile lateral
lobes ca. 4 × 4 mm; epichile broadly ovate-triangular, ca. 4 × 5
mm, adaxially with several papillate longitudinal ridges, apex
obtuse. Column ca. 4 mm. Fl. Apr–Jun.
Epiphytic on tree trunks in dense forests; 300–1100 m. S and SE
Yunnan [Bhutan, India (NE and Orissa), Laos, Thailand, Vietnam].
10. Luisia ramosii Ames, Philipp. J. Sci., C, 6: 55. 1911.
宽瓣钗子股 kuan ban chai zi gu
Stems often arching, ca. 28 cm, 4–5 mm in diam., internodes
ca. 1.5 cm. Leaves mostly on upper part of stem, 8–11
cm × 3.5–4 mm, obtuse. Inflorescences opposite to leaves, ca. 1
cm, 3–6-flowered; floral bracts broadly ovate-triangular, ca. 2
mm, thickly leathery. Flowers opening widely, purplish red,
thinly textured; pedicel and ovary ca. 8 mm. Dorsal sepal
elliptic, ca. 5 × 3 mm, concave, obtuse; lateral sepals slightly
oblique, oblong, ca. 6 × 3 mm, dorsally carinate and winged
toward apex; wing abruptly contracted and protruding from
apex forming an awn. Petals ovate, ca. 6.2 × 3.2 mm, obtuse;
lip 6–6.5 mm, strongly contracted near middle, with a distinct
boundary between epichile and hypochile; hypochile 5.5–7 mm
wide, broader than epichile, concave; epichile somewhat reniform-triangular,
5–6.2 mm wide, entire, obtuse. Column ca. 3
mm; stipe ovate, ca. 0.8 mm; viscidium suborbicular, large, ca.
1.3 mm wide. Fl. May–Jun. 2n = 38, 40.
Epiphytic on tree trunks in open forests along valleys; 100–500 m.
Guangxi, Hainan [Philippines, Vietnam].
Luisia trichorrhiza (Hooker) Blume was reported from Hainan
(Merrill & Metcalf, Lingnan Sci. J. 21: 12. 1945) and Xizang (K. Y.
Lang in C. Y. Wu, Fl. Xizang. 5: 776. 1987). The specimens reported
from Hainan were identified by us as Luisia ramosii, and those of
Xizang (Qinghai-Xiang Exp. Team 74–4223) remain doubtful, as they
only bear young fruit.
11. Luisia cordata Fukuyama, Bot. Mag. (Tokyo) 48: 306.
1934.
心唇钗子股 xin chun chai zi gu
Stems erect or pendulous, 30–60 mm, ca. 5 mm in diam.,
usually unbranched. Leaves ca. 20 cm × 3 mm, acute at apex.
Inflorescences 2- or 3-flowered; floral bracts distichous,
broadly ovate, ca. 3 mm, acute. Flowers often nodding, ca. 1 cm
in diam., sepals and petals green, lip deep purple-red; pedicel
and ovary green, ca. 1 cm. Dorsal sepal ligulate, ca. 5 × 3 mm,
5-veined, obtuse; lateral sepals ovate-lanceolate, cymbiform, ca.
6 × 4 mm, dorsally carinate, 7-veined, apex acute. Petals linear,
ca. 7.5 × 2 mm, acute; lip ca. 7 mm, fleshy, glabrous, without a
distinct boundary between hypochile and epichile; hypochile
ca. 3 × 4.5 mm, concave, lateral lobes very short; epichile cordate,
large, ca. 4 × 5 mm, with a swelling near apex. Column
ca. 3.5 mm. Fl. Jan.
● Epiphytic on tree trunks in thickets along the seashore. S
Taiwan.